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Helianthus giganteus
luxurians E. Watson (R. W. Long 1954). Hybrids of H. giganteus with H. divaricatus have been referred to as H. ambiguus (Torrey & A. Gray) Britton and H

4 KB (378 words) - 21:12, 5 November 2020
Helianthus hirsutus
and usually yellow (as opposed to dark) anther appendages, and from H. divaricatus by petioles and leaf blades 3-nerved distal to bases. Mexican plants of

4 KB (372 words) - 21:11, 5 November 2020